Sending customer a review link...why is this so hard?

I simply want to have a link to send a customer so they can review my business, but Google seems to have made it very difficult to do this. Once I figured out how to send a review link (thanks to a third party blog) I realised that if the user is not logged in, and I think it's safe to assume they're not, the page they get is useless: http://robinstent.com/gplus.png

Please tell me it's possible to send a link so that if the customer is not logged in they will get some kind of a clue how to leave a review. The link I'm using is: http://google.com/+vanoduk?review=1